More C++ tests

Change-Id: I92ce014a8ebe1c3b97f27aa15476fc3101cc1f1c

wpilibc/wpilibC++IntegrationTests/src/DIOLoopTest.cpp

@@ -0,0 +1,72 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2014. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "WPILib.h"
+#include "gtest/gtest.h"
+#include "TestBench.h"
+
+/**
+ * A fixture with a digital input and a digital output physically wired
+ * together.
+ */
+class DIOLoopTest : public testing::Test {
+protected:
+	DigitalInput *m_input;
+	DigitalOutput *m_output;
+	
+	virtual void SetUp() {
+		m_input = new DigitalInput(TestBench::kLoop1InputChannel);
+		m_output = new DigitalOutput(TestBench::kLoop1OutputChannel);
+	}
+	
+	virtual void TearDown() {
+		delete m_input;
+		delete m_output;
+	}
+	
+	void Reset() {
+		m_output->Set(false);
+	}
+};
+
+/**
+ * Test the DigitalInput and DigitalOutput classes by setting the output and
+ * reading the input.
+ */
+TEST_F(DIOLoopTest, Loop) {
+	Reset();
+	
+	m_output->Set(false);
+	EXPECT_FALSE(m_input->Get()) << "The digital output was turned off, but "
+		<< "the digital input is on.";
+	
+	m_output->Set(true);
+	EXPECT_TRUE(m_input->Get()) << "The digital output was turned on, but "
+		<< "the digital input is off.";
+}
+
+/**
+ * Test a fake "counter" that uses the DIO loop as an input to make sure the
+ * Counter class works
+ */
+TEST_F(DIOLoopTest, FakeCounter) {
+	Reset();
+	
+	Counter counter(m_input);
+	counter.Start();
+	
+	EXPECT_EQ(0, counter.Get()) << "Counter did not initialize to 0.";
+	
+	/* Count 100 ticks.  The counter value should be 100 after this loop. */
+	for(int i = 0; i < 100; i++) {
+		m_output->Set(true);
+		m_output->Set(false);
+	}
+	
+	EXPECT_EQ(100, counter.Get()) << "Counter did not count up to 100.";
+}
+